[1] VA Connecticut Healthcare Syst, Newington, CT USA
[2] Univ Bridgeport, Coll Chiropract, Bridgeport, CT 06601 USA
[3] Univ Pittsburgh, Med Ctr, Ctr Rehab Serv, Pittsburgh, PA 15260 USA
[4] Univ Penn, Dept Psychiat, Philadelphia, PA 19104 USA
[5] Univ Penn, Dept Anesthesiol, Philadelphia, PA 19104 USA
[6] Philadelphia VA Med Ctr, Pain Serv, Philadelphia, PA USA
[7] Univ Pittsburgh, Sch Med, Dept Med, Div Geriatr Med, Pittsburgh, PA 15260 USA
[8] VA Pittsburgh Healthcare Syst, GRECC, Pittsburgh, PA 15240 USA
[9] Durham VA Med Ctr, GRECC, Durham, NC USA
[10] Duke Univ, Med Ctr, Dept Med, Div Geriatr, Durham, NC 27706 USA
[11] Washington DC VA Med Ctr, Washington, DC USA
[12] Univ Pittsburgh, Dept Psychiat, Pittsburgh, PA USA
[13] Univ Pittsburgh, Anesthesiol, Pittsburgh, PA USA
[14] Univ Pittsburgh, Clin & Translat Sci Inst, Pittsburgh, PA USA